Power Limited Circuit Cable Form 3

The national electrical code nec class 2 and class 3 covers remote control signaling and power limited circuits covered by chapter 7 in article 725.

Power limited circuit cable form 3. The wiring has to be good enough for the type of circuit. If the power source isn t limited the circuit is non power limited. You can wire class 2 circuits with class 2 cable or any of its substitutes permitted by table 725 61 a depending on the condition of use. They are considered to be a special condition other than a normal power circuit.

3043a multi conductor 300v power limited tray cable. What i am asking about is when power limited is part of the cable description. Wiring is it power limited or non power limited. I want to use this cable to supply two ac circuits to a remote location in the machine.

In class 2 and class 3 systems either the voltage or the current depending upon circuit design is limited to a level that will not cause a fire and under. Any circuit that is above 30v or 100 va is considered not to be power limited even if there is a protection device like a fuse or circuit breaker. The nec defines such circuits as that portion of the wiring system between the load side of the overcurrent protection device ocpd or the power limited supply and all connected equipment. Class 1 2 and 3 circuits are classified as remote control signaling and power limited circuits in the national electrical code nec.

This is a 2 pair 16 awg shielded cable from belden. By itself wiring does not show if a circuit is power limited or non power limited. If the power source is power limited the circuit is power limited.